The First World War brought a lull to rallying. The Monte Carlo Rally was not resuscitated until 1924, but since then, apart from World War II and its aftermath, it has been an annual event and remains a regular round of the World Rally Championship. In the 1930s, helped by the tough winters, it became the premier European rally, attracting 300 or more participants.
Starting in 2011, rules for WRC cars changed to be more restrictive. Now regulations were derived from Super 2000 cars with a different aerodynamic kit. The cars were smaller models (there was no longer a minimum 4m length), with a 1600 cm3 direct injection turbo-charged engine with a 33 mm diameter air restrictor and a maximum pressure of 2.5 bar absolute (this will limit torque to about 400 N.m or less).
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A typical rally course consists of a sequence of relatively short (up to about 50 km (31 mi)), timed "special stages" where the actual competition takes place, and untimed "transport stages" where the rally cars must be driven under their own power to the next competitive stage within a generous time limit. Rally cars are thus unlike virtually any other top-line racing cars in that they retain the ability to run at normal driving speeds, and indeed are registered for street travel. Some events contain "super special stages" where two competing cars set off on two parallel tracks (often small enough to fit in a football stadium), giving the illusion they are circuit racing head to head. Run over a day, a weekend, or more, the winner of the event has the lowest combined special and super special stage times. Given the short distances of super special stages compared to the regular special stages and consequent near-identical times for the frontrunning cars, it is very rare for these spectator-oriented stages to decide rally results, though it is a well-known axiom that a team cannot win the rally at the super special, but they can certainly lose it.
While nowadays we are used to rally cars being visually close relatives to hot hatchbacks and saloons, it wasn’t always this way. The Lancia Stratos was the first car purpose built for the World Rally Championship; however, its rakish supercar looks and Ferrari-sourced V6 suggested it was better suited to the car park outside Monte Carlo’s casino than the world’s toughest rally stages.
In 1980, a German car maker, Audi, at that time not noted for their interest in rallying, introduced a rather large and heavy coupé version of their family saloon, installed a turbocharged 2.1 litre five-cylinder engine, and fitted it with four-wheel drive. Thus the Audi Quattro was born. International regulations had prohibited four-wheel drive; but FISA accepted that this was a genuine production car, and changed the rules. The Quattro quickly became the car to beat on snow, ice or gravel; and in 1983 took Hannu Mikkola to the World Rally Championship title. Other manufacturers had no production four-wheel drive car on which to base their response, so FISA was persuaded to change the rules, and open the Championship to cars in Group B. This allowed cars to be much further removed from production models, and so was created a generation of rallying supercars, of which the most radical and impressive were the Peugeot 205 T16, Renault 5 Turbo and the Lancia Delta S4, with flimsy fibreglass bodies roughly the shape of the standard car tacked onto lightweight spaceframe chassis, four-wheel drive, and power outputs reportedly as high as 600 hp (450 kW). Further Group B cars were developed by Ford (the RS200), British Leyland (the Metro 6R4) and many others, but these were less successful.
Colin McRae chose the 2006 Goodwood Festival of Speed to unveil the McRae R4, which had been conceived at the beginning of 2005. The intention was to make a cheaper alternative to WRCs (World Rally Cars) with significantly lower running costs. The McRae R4 was designed for use in rallying, rally cross, circuit racing and ice racing events, with the possibility of a one-make race series.